Apparatus for introducing yarns into draw-texturing machines

ABSTRACT

Apparatus for introducing yarn into draw-texturing machines wherein means are provided between the draw and texturing apparatus for enlarging the normal yarn path thus providing a start yarn reserve and releasing the yarn upon start of the texturing apparatus.

United States Patent Rebsamen et al.

APPARATUS FOR INTRODUCING YARNS INTO DRAW-TEXTURING MACHINES Inventors: Albert Rebsamen, Wilen; Paul Gubler, Herisau, both of Switzerland Assignee: I-Ieberlein and Co. AG., Wattwil,

Switzerland Filed: June 15, 1973 Appl. No.: 370,458

Foreign Application Priority Data June 2|, I972 Switzerland 9347/72 US. Cl. 28/].2; 57/34 HS; 226/l69 Int. Cl DOZg [/00 Field oi Search 28/l.2; 57/34 HS; 226/89, 226/90, 169; 66/!25 July 1, 1975 [56] References Cited UNITED STATES PATENTS 3,l66.822 l/l965 Starkie .4 57/34 HS X 3,201.956 8/l965 Liebraridt et al. 66/l25 R 3.729.916 5/l973 Lusk et al. .v 57/34 HS 3,766,726 10/[973 Carroll 4. 57/34 HS X Primary Examiner-Robert R. Mackey Attorney, Agent, or FirmFitzpatrick, Celia, Harper & Scinto [57] ABSTRACT Apparatus for introducing yarn into draw-texturing machines wherein means are provided between the draw and texturing apparatus for enlarging the normal yarn path thus providing a start yarn reserve and releasing the yarn upon start of the texturing apparatus.

2 Claims, 5 Drawing Figures 1 APPARATUS FOR INTRODUCING YARNS INTO DRAW-TEXTURING MACHINES The present invention relates to apparatus for introducing yarns into delivery devices and texturing devices of a draw-texturing machine.

In order to simplify operational sequences, various draw-texturing devices have been devised by which drawing and texturing can be effected in two subsequent steps. Such devices are, for example, known from German laid-open application No. 1,807,687. However, a special difficulty of such devices consists in that in the starting phase of the texturing process the tension between the last delivery device of the drawing apparatus and the texturing device rises so high that yarn breakages result.

To eliminate these disadvantages, it has already been suggested to couple the delivery devices to avoid excessive yarn tensions. This method, however, particularly when using convection heating, has not proven entirely satisfactory.

We have conceived an apparatus whereby we are able to avoid the disadvantages of the known devices and to introduce the yarn into such draw-texturing machines while assuring a safe start of the texturing process without the danger of yarn breakage.

According to the present invention, this task is primarily resolved by loosely inserting the yarn between the last delivery device of the drawing apparatus in the direction of yarn movement, and the texturing device. Thereby, during the start of the texturing process, tightening of the loose yarn portion is effected in a most simple way without the danger of yarn breakage. This purpose is achieved in a particularly advantageous way by first inserting the yarn under tension into the drawing device in order to effect drawing, and then introducing it into the texturing device, using a start reserve.

From the mechanical point of view, the objects of the present invention can be resolved in a particularly simple way by providing an additional holder between the last delivery device of the drawing apparatus and the texturing device, and outside the yarn path used during operation. By means of this additional holder, and while using the required start yarn reserve, the yarn can easily be guided and inserted into the texturing device in a way whereby the normal yarn path is elongated. Immediately before the start, the yarn can be brought back into its normal position by retracting the additional holder, the yarn start reserve being entirely available.

Such an additional holder could also be dispensed with if an additional delivery device is provided before the texturing device so that the yarn reserve could be available upon insertion of the yarn between the additional delivery device and the last delivery device of the drawing apparatus.

As, however, the amount of the reserve could be influenced by individual factors, we suggest that the additional holder be arranged on a lever which can be swivelled into at least two positions, the holder, while in operation, being positioned to guide the yarn outside the normal yarn path, such position being regarded as the yarn inserting position, and out of engagement with the yarn when in non-operating position.

A particularly simple construction is achievable if the output delivery of the drawing apparatus has a fixed drive roller and at least one pressure roller fixed on a swivelling lever and swivellable away from the drive roller with the swivelling lever for inserting the yarn, as then the additional holder can be fixed on the swivelling lever in a most simple manner.

For adaptation of insertion of the yarn to various yarn materials, it is advantageous if the additional holder can be fixed in various positions so that after insertion of the yarn and swivelling into operating position, the appropriate start yarn reserve is present.

It can also be advantageous if the additional holder is a pinching device by which, during insertion, an exactly definable start yarn reserve can be established.

it is also easy to realize the objects of the present in vention on already completely mounted draw-texturing machines if the additional holder is in the form of a pin around which, for establishing the start reserve, the yarn is wrapped once during insertion and is removed before starting the machine. Removal can then also be achieved so that the pin can be swivelled into the guide path to insert the yarn and can be swivelled back for removing the yarn.

There has thus been outlined rather broadly the more important features of the invention in order that the detailed description thereof that follows may be better understood, and in order that the present contribution to the art may be better appreciated. There are, of course, additional features of the invention that will be described hereinafter and which will form the subject of the claims appended hereto. Those skilled in the art will appreciate that the conception upon which this disclosure is based may readily be utilized as a basis for the designing of other structures for carrying out the several purposes of the invention. It is important, therefore, that the claims be regarded as including such equivalent construction as do not depart from the spirit and scope of the invention.

Specific embodiments of the invention have been chosen for purposes of illustration and description, and are shown in the accompanying drawings, forming a part of the specification wherein:

FlG. l is a schematic view of a draw-texturing device including the features of the present invention;

FIG. 2a and 2b illustrate a modified example of a holder according to the present invention in initial and yarn release position, respectively.

FIG. 3 illustrates schematically an additional holder with a pinching device; and

FIG. 4 shows a simplified embodiment of an additional holder in the form of a pin.

Referring now to the drawings, the yarn l is removed from a bobbin (not shown) and stretched at a ratio of, for example, 1 5 between delivery means 2 and 3. The drawing device comprises a heating unit 4 for heating the yarn during drawing. From the delivery means 3, the yarn 1 is delivered to the convection heater 5 and the texturing device 6. As shown, the yarn path in normal operation is vertical after the delivery means 3.

According to FIG. I, there is provided an additional holder 7 which, upon insertion of the yarn, is brought into the position shown in broken lines by means of lever 8 so that the yarn is at first inserted along the path also shown in broken lines to enlarge the guide path of the yarn and to assure a start yarn reserve after the lever 8 has been swivelled back into the vertical position shown in solid lines.

in FIGS. 2a, 2b, we show a modified example of the invention in which an additional holder 9 is directly fixed on a swivelling arm which also carries pressure rollers 11 over which an endless belt passes. As shown in FIG. 2a, the yarn is applied over the pressure rollers H and belt 15 for insertion, brought into engagement with the additional holder 9 and then directed downward for insertion into the texturing device (not shown). After the inserting operation has been completed, the swivelling arm 10 is brought into the position shown in FIG. 2b whereby the yarn l is pressed against drive roller 12 by means of pressure rollers 11 and belt 15. At the same time, the yarn l is disengaged from the additional holder 9, thus liberating the start reserve.

According to FIG. 3, the additional holder comprises a pinching device 13 with which yarn 1 can be held during insertion and by the release of which, against the biasing force of a spring 130, and start yarn reserve is liberated. The insertion process can be adapted to yarns of various types and the length of the yarn reserve can be varied in a simple way by selectively inserting the yarn in one of several grooves a, b or c, for example in the pinching device 13.

FIG. 4 shows, as a simplified example, a pin 14 in the form of an additional holder. The start yarn reserve is obtained in this case, as shown in broken lines, by first winding yarn around pin 14 and removing it by shifting either the pin or yarn so that the yarn passes the end of the pin as shown by the solid line before starting the operation of the texturing machine.

From the foregoing description it will be seen that we have contributed a method and apparatus according to which we are able to introduce a yarn end safely into draw-texturing apparatus to permit commencement of the process without yarn breakage. We believe that the construction and opeeration of our novel concept will now be understood, and that the advantages thereof will be fully appreciated by those persons skilled in the art.

We claim:

1. Apparatus for introducing a yarn into drawtexturing machines which include delivery devices (2,3) and texturing means (5,6), characterized by yarn holding means (9,11,15) positioned between said delivery devices and said texturing means to provide a yarn guide path longer than the normal yarn guide path between said delivery devices and texturing means, and means (10) shifting said yarn holding means out of engagement with the yarn prior to operation of said texturing means whereby the yarn tension is reduced and a start yarn reserve is provided, one of said delivery devices (3) on the output side of the drawing device including a fixedly located drive roller (12) and said yarn holding means comprising at least one pressure roller (11) around which the yarn passes, said pressure roller being movable between a first yarn insertion position away from the drive roller wherein the yarn is out of contact with the latter, and a second normal position wherein the yarn contacts the drive and pressure rollers, and an additional holder (9) arranged to support the yarn when same is in yarn insertion position and to release same to normal position when said pressure roller moves from its first to its second position.

2. Apparatus according to claim 1, wherein the yarn holding means includes two pressure rollers (11) over which an endless belt (15) passes and around which the yarn is applied. 

1. Apparatus for introducing a yarn into draw-texturing machines which include delivery devices (2,3) and texturing means (5,6), characterized by yarn holding means (9,11,15) positioned between said delivery devices and said texturing means to provide a yarn guide path longer than the normal yarn guide path between said delivery devices and texturing means, and means (10) shifting said yarn holding means out of engagement with the yarn prior to operation of said texturing means whereby the yarn tension is reduced and a start yarn reserve is provided, one of said delivery devices (3) on the output side of the drawing device including a fixedly located drive roller (12) and said yarn holding means comprising at least one pressure roller (11) around which the yarn passes, said pressure roller being movable between a first yarn insertion position away from the drive roller wherein the yarn is out of contact with the latter, and a second normal position wherein the yarn contacts the drive and pressure rollers, and an additional holder (9) arranged to support the yarn when same is in yarn insertion position and to release same to normal position when said pressure roller moves from its first to its second position.
 2. Apparatus according to claim 1, wherein the yarn holding means includes two pressure rollers (11) over which an endless belt (15) passes and around which the yarn is applied. 